Valerio, Luca, De centro gravitatis solidorvm libri tres

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1
PROPOSIT'IO XXVII.
Solida grauia æquiponderant à longitudini­
bus ex contraria parte reſpondentibus.
Sint ſolida grauia A, & B, quorum centra grauitatis
ſint A, B, ſecundum quæ ſuſpenſa intelligantur A, in
puncto C, & B, in puncto D, cuiuslibet rectæ GH, quæ
ſit ita diuiſa in puncto E, vt ſit DE, ad EC, vt eſt A,
ad B.
Dico ſolida A, E, æquiponderare à longitudini­
bus DE, EC; hoc eſt vtriuſque ſimul centrum grauita­
tis eſse E.
Nam ſi A, B, ſint æqualia, manifeſtum eſt
propoſitum: ſi au­
tem inæqualia, eſto
maius A: maior igi
tur erit DE, quam
EC. abſcindatur
DF, æqualis EC:
erit igitur DE, æ­
qualis GF: & CD,
vtrin que producta,
ponatur DH, æ­
qualis DF: & CG,
ipſi CF. & circa
axim, & altitudinem
GH, eſto paralle­
lepipedum KL, æ­
quale duobus ſo­
39[Figure 39]
lidis A, B, ſimul & parallelepipedum KL, ſecetur plano
per punctum F, oppoſitis planis parallelo, in duo paral­
lelepipeda KN, ML.
Quoniam igitur eſt vt GF, ad
FH, ita parallelepipedum KN, ad parallelepipedum

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